If you're going to try this....

The fee should be proportional to income.

I suggest that service in the military should only be relevant if you're voting on military matters. Perhaps having been a civilian in a battle zone should count, too.

There may be ways to define relevant experience in other matters, but it's tricky. Is having been a student enough to give added weight to one's votes about education?

The interesting question about literacy tests would be how you keep them honest-- the historical problem is that blacks and whites didn't get the same test.

I've thought that requiring all votes to be write-ins would be a way of checking on knowledge and/or commitment.

I was thinking about a prediction test, too-- it's very much in the spirit of LW.

I think Congress shouldn't be voting on the predictions-- if the result is that ambiguous, the prediction shouldn't be counted.

What problems do you think your suggestions have? What problem are you trying to solve?